Process for removing the cavities in recently-cast ingots.



, B. TALBOT. PROCESS FOR REMOVING THE GAVITIES IN RECENTLY CAST INGOTSAPPLICATION FILED MAR-13, I918.

Patented Feb. 11, 1919..

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BENJAMIN TALBOT, OF MIDDLESBROUGH, ENGLAND.

PROCESS FOR REMOVING THE CAVITIES IN RECENTLY-CAST INGOTS.

Specification of Letters Patent.

Patented Feb. 11, 1919.

Application filed March 13, 1918. Serial No. 222,184.

To all whom it may concern:

Be it known that I, BENJAMIN TALBOT, a subject of the King of GreatBritaln, res ding in Middlesbrough, England, have 1nvented a certain newand useful Process for Removing the Cavities in Recently-Cast Ingots, ofwhich the followlng is a specification.

To remove the cavity or piping which normally forms near the top of thecast iron or steel ingot and to difluse the segregatlon, it hasheretofore been proposed to compress the ingot either while in its moldor after removal by presses or rolling either while the interior of suchingot is still in a molten or plastic state or after it has beenre-heated, and inaddition to the pressure method it has been proposed toemploy means for keeping the upper portion of the ingot hot after thelower portion has set, say for example by employing ganister or bricktops or limngs at the upper portion of the ingot or by forming anannular chamber there and filling it with molten slag or the like, or bycovering the ingot top with heat insulating materials; various otherproposals for the same purpose also have been put forward.

The present invention relates to a process of removing the cavityanddilfusing the segregation by compressing the upper portion of a recentlycast ingot before the interior of this part is entirely solidified; theprocess can be applied if the ingot has simply been cast in an ordinaryiron mold, but it is believed that better results can be attained whenthe casting has been effected in a composite or topped mold as indicatedabove, as in such case with proper manipulation it is believed that avery substantial decrease in the amount of waste or crop end to bediscarded will be secured. 7

According to this invention, it is proposed to employ a series ofoppositely set hydraulically operated rams (for example,

one for each face of the ingot) carrying heads or'dies of less widththan the ingot face and so formed as to produce when employed a concavedepression. Preferably extending from below the bottom of the ingotscavity at least as far as the part at which the crop will be made.

The accompanying drawing shows dia- Copies of this patent may beobtained for grammatically an example of means for compressing theingot. Figure 1 is a plan view of four hydraulic rams arranged in pairs,the members of each pair being disposed in the same straight line and onopposite sides of the ingot. Fig. 2 is a vertical section on the line 22of Fig. 1.

A is the ingot, B B B B, hydraulic rams, B being opposite B and Bopposite B The operative faces of the rams are formed of the dimensionsand curvature suited to produce the required depressions in the ingot A.The depressions are shown in Figs. 1 and 2.

Having thus fully described the nature of my said invention and the bestmeans I know for carrying the same into practical effect, I claim 1. Aprocess for removing the cavity in a recently cast ingot, consisting inapplying pressure to form depressions in the top portion of the ingotand on opposite sides thereof.

2. A process for removing the cavity in a recently cast ingot,consisting in applying pressure to form depressions in the top portionof the ingot and on opposite sides thereof, the said depressionsextending from below the bottom of the cavity at least as far as thepart at which the crop will be made.

3. A process for removing the cavity in a recently cast ingot,consisting in applying pressure on opposite sides of the said ingot andat the same horizontal level.

4. A process for removing the cavity in a recently cast ingot,consisting in applying pressure on opposite sides of the said ingot andat the same horizontal level, pressure being applied on each face of theingot.

5. A process for removing the cavity in a recently cast ingot,consisting in applying pressure to the opposite faces of and formingdepressions in the ingot of less width than said faces.

7 In testimonywhereof I have signed my name to this specification in thepresence of two subscribing. witnesses.

BENJAMIN TALBOT.

Witnesses:

C. S. HOPKINS, W. J. SKERTEN.

five cents each, by addressingythe Commissioner of Patents, .rWashington, 13.0.

